Benthic communities and biodiversity in Thai mangrove swamps

1.实地研究是在泰国Samut Songkram省的Klong Kone红树林沼泽地进行的。在对红树林沼泽地进行了全面调查之后，我们在沿着选择了几个采样点进行了详细的采样。选择这些研究点是为了涵盖该地区的各种环境条件：从泥滩到红树林的向陆地边缘。测定了沉积物的温度和Eh以及间隙水中的pH、盐度和营养盐浓度。泥滩沉积物中有机质含量低于林内。我们开始监测工作。我们分别研究了底栖动物和树木动物，进行定量和定性采样。在外部泥滩，一个alphaeid虾，口足类，和ocypodid蟹经常遇到的物种。贝类也很常见，多毛类蠕虫是经常采样的动物。在前红树林边缘区，底栖动物与泥滩相似。在森林的向陆边缘，有大量的侵蚀性螺类和刺螺类腹足类，两种蟹类和蟹类是红树林森林区系的主要成员。采集蟹类进行胃内容物分析和异速生长研究.我们原计划研究底栖动物对废弃红树林沼泽的酸化过程，但这次未能找到合适的研究地点。为了对一些有用的动物进行种群研究，我们选择了一种贝类（Anadara）。测量贝壳大小后，将鸟蛤放入笼中，并设置在几个选定的地块，以跟踪生存和生长。为了研究藤壶的定殖过程，在几种不同的环境中设置塑料杆作为监测工作的沉降基质。

1. Field studies were conducted at the Klong Kone mangrove swamps in Samut Songkram Province in Thailand. Following a general survey of the mangrove swamps, we selected several points for detailed samplings along two transact lines. These study points were selected in order to cover various environmental conditions in the area : from mud flat to landward fringe of the mangrove forest.2. Temperature and Eh of the sediments and pH,salinity and nutrient concentrations in the interstitial water were measured. Organic matters in the sediments at the mud flat were lower than those inside the forest. We started monitoring works.3. We studied benthic fauna and tree fauna separately, conducting both quantitative and qualitative samplings. In outer mud flat, an alphaeid shrimp, a stomatopod, and ocypodid crabs were regular species encountered. Cockle was also frequent and polychaete worms were regular animals to be sampled. In the seeward ex-mangrove fringe, benthic fauna was similar to that in the mud flat. In the landward fringe of the forest, erobid snails were abundant and neritid gastropod was also found. Two species of ocypodid crabs and sesarmid crabs were prominent members in the mangrove forest fauna. Crabs were collected for analysis of stomach content and allometry studies.4. We had planned to study recolonization process of the discarded mangrove swamps by benthic animals.However, we could not find appropriate places for such study this time.5. For population studies of some useful animals, we selected a cockle (Anadara). After measurement of shell size, cockles were put in the cages and set at several selected plots to follow survival and growth. For the studies of colonization processes of the barnacles, plastic poles were set at several different environments as the settlement substrate for monitoring works.